The new SRAM DUB(TM) bottom bracket series has the simple job of connecting your crankarms and protecting the smooth, long-lasting application of power to your drivetrain. To allow that singular focus, the DUB(TM) spindle has been engineered to be the one true unifying component. One oversized spindle to work across every bottom bracket standard. For better crankarm compatibility. For better protection from the elements. For longer-lasting performance. To be stronger, smoother, simpler. One oversized spindle to work across every bottom bracket standard Gutter Seal Technology(TM) drastically improves sealing against the elements Significantly lighter than GXPA(R) system Features and Benefits: Gutter Seal Technology(TM) Sealed cartridge bearings ISO 4210 compliant. Specifications: BB-frame interface: English/BSA 68/73mm Crank-BB interface: DUB Bearing type: Standard Spindle diameter: DUB Cup material: Aluminium